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Boring device

a technology of boring device and punching unit, which is applied in the field of punching unit, can solve the problems of many parts of the camera type punching unit, and achieve the effect of reducing the number of sensors and reducing the cost of the punching uni

Inactive Publication Date: 2008-12-02
DAIDO KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution reduces the total number of punches and dies required, simplifies the structure, and lowers costs while enabling multi-functionality in image forming apparatuses by allowing for different hole punching processes with fewer parts.

Problems solved by technology

However, such sliding-cam type punching unit requires many parts because it requires punches and dies each equal to a total number of holes to be punched, e.g., five each punches and dies in the switching type punching unit for punching two and three holes.

Method used

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Experimental program
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first embodiment

[0037]A first embodiment of an inventive punching unit will be explained below with reference to the drawings. FIG. 1 is a partially broken front view of the punching unit according to the first embodiment of the invention, FIG. 2 is a plan view of the punching unit in FIG. 1, FIG. 3 is a section view of the punching unit taken along a line A-A in FIG. 1, FIG. 4 is a section view of the punching unit taken along a line B-B in FIG. 1 and FIGS. 5A through 5C are section views of the punching unit for explaining operations of the punching unit of the present embodiment.

[0038]As shown in FIGS. 1 and 2, the punching unit 30 of the present embodiment has a rectangle-tubular main frame 31, on which a motor 33 is disposed through an intermediary of a bracket 32. The motor 33 is linked to a lengthy cam plate (reciprocating member) 35 through an intermediary of a speed reducing gear mechanism 34 and functions as a driving source for moving the cam plate 35 in the lateral direction in FIG. 1. ...

second embodiment

[0087]Next, a second embodiment of the inventive punching unit will be explained with reference to FIGS. 6 through 11. FIG. 6 is a partially broken front view of a punching unit according to a second embodiment of the invention, FIG. 7 is a plan view of the punching unit in FIG. 6, FIG. 8 is a bottom view of the punching unit in FIG. 6, FIG. 9 is a side view of the punching unit taken along a line E-E in FIG. 6, FIG. 10 is a side section view of the punching unit taken along a line F-F in FIG. 6 and FIG. 11 is a partially enlarged front view of a movable range detecting sensor, a rack and others in FIG. 6.

[0088]As shown in FIGS. 6 through 11, the punching unit 60 of the present embodiment is provided with a motor 73 on a main frame 70 through an intermediary of a bracket 71. The motor 73 is linked to a lengthy cam plate (reciprocating member) 75 through the intermediary of a speed reducing gear mechanism 74 and functions as a driving source for moving the cam plate 75 in the lateral...

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Abstract

A punching unit is arranged so that a plurality of punches is grouped into a first group having a predetermined number of punches and a second group containing any one of the punches in the first group and having a smaller number of punches. A punching state of the predetermined number of punches is produced by reciprocating a reciprocating member within a first range and by vertically moving the punches of the first group through the intermediary of cams and followers corresponding to the first group and another punching state of the smaller number of punches is reached by reciprocating the reciprocating member within a second movable range and vertically moving the punches of the second group through the intermediary of cams and followers corresponding to the second group. This arrangement allows the number of punches and dies to be reduced as compared to the prior art.

Description

TECHNICAL FIELD[0001]The present invention relates to a punching unit for punching holes in a sheet type member by engaging punches with corresponding dies and more specifically to a punching unit which may be most suitably attached to a main unit of an image forming apparatus, such as a copying machine, a printer, a facsimile and a multifunction machine of those machines, or to a printing machine.BACKGROUND ART[0002]Hitherto, as a punching unit of the sort described above, there have been known a dedicated type punching unit dedicated for punching two holes, three holes or four holes and a switching type punching unit arranged so as to be able to commonly use punches in punching two holes and three holes or two holes and four holes. As the switching type punching unit, there is known a sliding-cam type punching unit wherein a stroke range of a cam is divided into two stages so as to be able to punch two holes in a certain stroke range and to punch three holes in another stroke rang...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B26F1/04B26F1/14B26D5/16B26F1/36
CPCB26D5/16B26F1/04B26F1/36Y10T83/8727Y10T83/943
Inventor MAJIMA, TOSHIYUKINISHIMURA, KAZUO
Owner DAIDO KOGYO CO LTD
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